<template>
  <SvgIcon :size="size" :name="getSvgIcon" v-if="isSvgIcon" :class="[$attrs.class, 'anticon']" :spin="spin" />
  <span v-else ref="elRef" :class="[$attrs.class, 'app-iconify anticon', spin && 'app-iconify-spin']" :style="getWrapStyle"></span>
</template>
<script lang="ts">
import type { PropType } from 'vue';
import { defineComponent, ref, watch, onMounted, nextTick, unref, computed, CSSProperties } from 'vue';
import SvgIcon from './src/SvgIcon.vue';
import Iconify from '@purge-icons/generated';
import { isString } from '@/utils/is';
import { propTypes } from '@/utils/propTypes';

const SVG_END_WITH_FLAG = '|svg';
export default defineComponent({
  name: 'Icon',
  components: { SvgIcon },
  props: {
    // icon name
    icon: propTypes.string,
    // icon color
    color: propTypes.string,
    // icon size
    size: {
      type: [String, Number] as PropType<string | number>,
      default: 16,
    },
    spin: propTypes.bool.def(false),
    prefix: propTypes.string.def(''),
  },
  setup(props) {
    const elRef = ref(null);

    const isSvgIcon = computed(() => props.icon?.endsWith(SVG_END_WITH_FLAG));
    const getSvgIcon = computed(() => props.icon.replace(SVG_END_WITH_FLAG, ''));
    const getIconRef = computed(() => `${props.prefix ? props.prefix + ':' : ''}${props.icon}`);

    const update = async () => {
      if (unref(isSvgIcon)) return;

      const el: any = unref(elRef);
      if (!el) return;

      await nextTick();
      const icon = unref(getIconRef);
      if (!icon) return;

      const svg = Iconify.renderSVG(icon, {});
      if (svg) {
        el.textContent = '';
        el.appendChild(svg);
      } else {
        const span = document.createElement('span');
        span.className = 'iconify';
        span.dataset.icon = icon;
        el.textContent = '';
        el.appendChild(span);
      }
    };

    const getWrapStyle = computed((): CSSProperties => {
      const { size, color } = props;
      let fs = size;
      if (isString(size)) {
        fs = parseInt(size, 10);
      }

      return {
        fontSize: `${fs}px`,
        color: color,
        display: 'inline-flex',
      };
    });

    watch(() => props.icon, update, { flush: 'post' });

    onMounted(update);

    return { elRef, getWrapStyle, isSvgIcon, getSvgIcon };
  },
});
</script>
<style lang="less">
.app-iconify {
  display: inline-block;
  // vertical-align: middle;

  &-spin {
    svg {
      animation: loadingCircle 1s infinite linear;
    }
  }
}

span.iconify {
  display: block;
  min-width: 1em;
  min-height: 1em;
  border-radius: 100%;
  background-color: @iconify-bg-color;
}
</style>
